Installing Door Sounder Sensors

You need to install Door Sounder sensors in pockets welded to the trawl doors.

Before you begin

To install Door Sounder sensors on the doors, you need to have specifically designed sensor pockets welded to the trawl doors. See Installing Sensor Pockets.

About this task

  • The sensor down sounder must have a roll angle of 25° in relation to the door.
  • Attack angle: 25-40°
  • Elevation angle: 15-20°. Adjust the angle so that the sensor points toward the vessel during operation.

Procedure

  1. Remove the screw holding the pocket cover.
  2. Install Door Sounder sensors inside each door pocket: the top of the transducer (side with marker on housing) must be oriented toward the vessel and the side with the circle/A must points downwards with an angle of 25° in relation to the door.
    Note: For bottom trawling, install sensors on the lower part of doors.
  3. Attach the safety line from the sensor to the pocket and fasten the pocket's screw.
  4. Make sure there is nothing in front of the sensors that would hide their signal toward the vessel, and nothing in front of the down sounder.